1 //===-- MSP430ELFStreamer.cpp - MSP430 ELF Target Streamer Methods --------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file provides MSP430 specific target streamer methods.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "MSP430MCTargetDesc.h"
15 #include "llvm/BinaryFormat/ELF.h"
16 #include "llvm/MC/MCContext.h"
17 #include "llvm/MC/MCELFStreamer.h"
18 #include "llvm/MC/MCSectionELF.h"
19 #include "llvm/MC/MCStreamer.h"
20 #include "llvm/MC/MCSubtargetInfo.h"
21
22 using namespace llvm;
23
24 namespace llvm {
25
26 class MSP430TargetELFStreamer : public MCTargetStreamer {
27 public:
28 MCELFStreamer &getStreamer();
29 MSP430TargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI);
30 };
31
32 // This part is for ELF object output.
MSP430TargetELFStreamer(MCStreamer & S,const MCSubtargetInfo & STI)33 MSP430TargetELFStreamer::MSP430TargetELFStreamer(MCStreamer &S,
34 const MCSubtargetInfo &STI)
35 : MCTargetStreamer(S) {
36 MCAssembler &MCA = getStreamer().getAssembler();
37 unsigned EFlags = MCA.getELFHeaderEFlags();
38 MCA.setELFHeaderEFlags(EFlags);
39
40 // Emit build attributes section according to
41 // MSP430 EABI (slaa534.pdf, part 13).
42 MCSection *AttributeSection = getStreamer().getContext().getELFSection(
43 ".MSP430.attributes", ELF::SHT_MSP430_ATTRIBUTES, 0);
44 Streamer.SwitchSection(AttributeSection);
45
46 // Format version.
47 Streamer.EmitIntValue(0x41, 1);
48 // Subsection length.
49 Streamer.EmitIntValue(22, 4);
50 // Vendor name string, zero-terminated.
51 Streamer.EmitBytes("mspabi");
52 Streamer.EmitIntValue(0, 1);
53
54 // Attribute vector scope tag. 1 stands for the entire file.
55 Streamer.EmitIntValue(1, 1);
56 // Attribute vector length.
57 Streamer.EmitIntValue(11, 4);
58 // OFBA_MSPABI_Tag_ISA(4) = 1, MSP430
59 Streamer.EmitIntValue(4, 1);
60 Streamer.EmitIntValue(1, 1);
61 // OFBA_MSPABI_Tag_Code_Model(6) = 1, Small
62 Streamer.EmitIntValue(6, 1);
63 Streamer.EmitIntValue(1, 1);
64 // OFBA_MSPABI_Tag_Data_Model(8) = 1, Small
65 Streamer.EmitIntValue(8, 1);
66 Streamer.EmitIntValue(1, 1);
67 }
68
getStreamer()69 MCELFStreamer &MSP430TargetELFStreamer::getStreamer() {
70 return static_cast<MCELFStreamer &>(Streamer);
71 }
72
73 MCTargetStreamer *
createMSP430ObjectTargetStreamer(MCStreamer & S,const MCSubtargetInfo & STI)74 createMSP430ObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
75 const Triple &TT = STI.getTargetTriple();
76 if (TT.isOSBinFormatELF())
77 return new MSP430TargetELFStreamer(S, STI);
78 return nullptr;
79 }
80
81 } // namespace llvm
82